Download E-books Linux Kernel Networking: Implementation and Theory (Expert's Voice in Open Source) PDF

By Rami Rosen

Linux Kernel Networking takes you on a guided in-depth journey of the present Linux networking implementation and the speculation in the back of it. Linux kernel networking is a fancy subject, so the ebook will not burden you with themes in some way concerning networking. This ebook also will no longer overload you with bulky line-by-line code walkthroughs in a roundabout way regarding what you are trying to find; you will find simply what you wish, with in-depth motives in each one bankruptcy and a short reference on the finish of every chapter.

Linux Kernel Networking is the one updated reference consultant to figuring out how networking is carried out, and it'll be essential in future years due to the fact such a lot of units now use Linux or working structures in keeping with Linux, like Android, and because Linux is so commonplace within the information middle enviornment, together with Linux-based virtualization applied sciences like Xen and KVM.

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Read or Download Linux Kernel Networking: Implementation and Theory (Expert's Voice in Open Source) PDF

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The subsequent part discusses the iproute2 and the older net-tools applications. The iproute2 package deal relies upon netlink sockets, and you’ll see an instance of utilizing netlink sockets in iproute2 within the part “Adding and deleting a routing access in a routing table”, later during this bankruptcy. I point out the net-tools package deal, that's older and may be deprecated sooner or later, to stress that as a substitute to iproute2, it has much less strength and no more skills. Userspace programs for Controlling TCP/IP Networking There are userspace programs for controlling TCP/IP networking and dealing with community units: net-tools and iproute2. The iproute2 package deal comprises instructions just like the following: u ip: For administration of community tables and community interfaces u tc: For site visitors regulate administration u ss: For dumping socket facts u lnstat: For dumping linux community facts u bridge: For administration of bridge addresses and units 15 CHAPTER 2 N NETLINK SOCKETS The iproute2 package deal is primarily based on sending requests to the kernel from userspace and getting replies again over netlink sockets. There are a number of exceptions the place IOCTLs are utilized in iproute2. for instance, the ip tuntap command makes use of IOCTLs to add/remove a TUN/TAP gadget. in case you examine the TUN/TAP software program driving force code, you’ll locate that it defines a few IOCTL handlers, however it doesn't use the rtnetlink sockets. The net-tools package deal relies on IOCTLs and contains identified instructions like those: u ifconifg u arp u direction u netstat u hostname u rarp a few of the complicated functionalities of the iproute2 package deal aren't on hand within the net-tools package deal. the subsequent part discusses kernel netlink sockets—the middle engine of dealing with communique among userspace and the kernel via changing netlink messages of other varieties. studying approximately kernel netlink sockets is key for knowing the interface that the netlink layer offers to userspace. Kernel Netlink Sockets You create a number of netlink sockets within the kernel networking stack. each one kernel socket handles messages of alternative varieties: so for instance, the netlink socket, which may still deal with NETLINK_ROUTE messages, is created in rtnetlink_net_init(): static int __net_init rtnetlink_net_init(struct web *net) { ... struct netlink_kernel_cfg cfg = { . teams = RTNLGRP_MAX, . enter = rtnetlink_rcv, . cb_mutex = &rtnl_mutex, . flags = NL_CFG_F_NONROOT_RECV, }; sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); ... } notice that the rtnetlink socket knows community namespaces; the community namespace item (struct internet) encompasses a member named rtnl (rtnetlink socket). within the rtnetlink_net_init() technique, after the rtnetlink socket used to be created through calling netlink_kernel_create(), it really is assigned to the rtnl pointer of the corresponding community namespace item. sixteen CHAPTER 2 N NETLINK SOCKETS Let’s glance in netlink_kernel_create() prototype: struct sock *netlink_kernel_create(struct web *net, int unit, struct netlink_kernel_cfg *cfg) u the 1st parameter (net) is the community namespace.

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